Improvement in fire-back linings



c. T uESDALE. Fire-Back Linings. Nei l-7,881 P atented Feb. 24,1874.

Illllll Unrrnn STATES PATENT QFFIGE.

CHARLES TRUESDALE, OF CINCINNATI, OHIO.

IMPROVEMENT IN FlRE-BAK LININGS.

Specification forming part of Letters Patent No. 1 122 881, dated February 24, 1874 application filed January 26, 1874.

To all whom it may concern:

Be it known that I, CHARLES TRUESDALE, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Lining or Fire-Back for Stoves, of which the following is a specification:

My said improved fire-back or lining consists, essentially, of a congeries of separable plates, blocks, or sections, capable of being attached to or detached from a suitable frame or backing, the said blocks, in their attached con dition, being insulated from one another sufficiently to avoid the liability of the jamming or warping incident to the excessive expansion of east-ir0n when repeatedly heated, so as to seriously distort or contract the fire-chamber. The distinct, isolated, and separable character of my component lining-blocks renders each one free from any influence that might otherwise arise from distortion of the contiguous portions; and their detachability enables the easy removal of a damaged, and the insertion of an undamaged, block, without the necessity of taking out and replacing an entire fire-back or linin The said lining and the inclosin g parts of the stove are, preferably, so formed as to secure a free admission of fresh air to every part of the linin I will describe my improvement as adapted for use as the fire-back of a common cookstove, for which purpose it is more especially designed. i

In the accompanying drawings, Figure 1 is a perspective view of my improved sectional fireback detached from the stove, and resting up on'the grate-bearer. Fig. 2 is a section of the fire-back at the line X X. Fig. 3 is a vertical section at the line Y Y, showing my improved lire-back in position within a cook-stove. Fig. 4 is a perspective view of the lining-frame in position on the grate-bearer. Fig. 5. is a perspective view of the rear side of one of the said blocks. Figs. 6, 7 and 8 show modifications of my block-fastenings, the latter illustration being drawn on an enlarged scale.

A may represent any suitable grate frame or bearer, the form here shown being adapted for a tipping or dumping grate, suchas employed by me. From the rear edge of the bearer A projects a flange, B, widened at intervals to form lugs (3, upon which rests the lower edgeof my lining-frame or backing D, which may be of form substantially as represented-that is to say, concave in vertical sec tion on its front sideand having the oblique slots E E in diverging pairs, as shown, those portions F of the backing between the slots of each respective pair being concave in horizontal section, for the two-fold purpose of insuring strength and elasticity to the backin g, and of affording an air space or chamber for the cooling of the section, as hereinafter explained.

For the more effectual admission of air, as aforesaid, and to lighten the casting, each portion F may have an orifice, f.

My sectional fire plates or blocks Gr 'are curved in vertical section to correspond with the said backing, and have projecting rearwardly from their top edge a flange, H, which, in situ, rests upon the top flange d of the backing l). Projecting from the lower end of each section is a hook, I, which, in sita, engages underneath the flangeB of the grate-bearer. The front or fire face of each section is, preferably, ribbed, J, for the several purposes of stiffen- .ing the same, and of holding ashes, whose nonconducting properties protect the section from intense heat, and also serve the purpose of upholding the fuel and admitting air to its rear portion. tion are hooks K K, which, being insert-ed through the slots E E, engage behind the flaring portions or bars F of the backing 1D, and, be-

ing slid down to their places, tightly embrace said portions. The backing, thus lined wit-h fire-blocks, is inserted in the stove, and the hooks I engage under the flange B of the bearer A. when in place, to leave intervals between them sufficient to avoid any injurious contact under any possible swelling of the blocks by heat,

and these intervals may be incidentally useful Projecting from the rear of each seelhe blocks G are of such width as,

and the ribs J and air -passage F f may be I omitted.

Whichever form of retaining device is employed for coupling the removable blocks to the frame-,itis preferred to have said device attached at or near the middle ofsuch block. \Vhcn thus applied, it is evident the blocks willbefrec to expand and contract in every direction without exerting any injurious strain upon the hooks, lugs, pins, or bolts, which advantage would not be obtained in case the retaining devices were situated near the sides or ends of the blocks, or if the latter were inserted in a frame, and so surrounded with metal as to necessitate the cracking either of the blocks or frame itself.

It willbe seen that any expansion of a block will rather loosen than tighten the grasp of the hooks K K upon the part F; and, consequently, that there can be no danger of warping or strain ing the block, or that to which it is attached. The hook-shaped lugs at the bottom of the blocks constitute another advantageous feature peculiar to the fire-back, because, by engaging under the grate-frame, they effectually prevent the blocks being elevated and dislodged from their proper position in shipping, or by prying action of the poker when the fire is stirred by a careless operator.

I claim herein as new and of my invention- 1. The backing D, constructed with flaring CHARLES TRUESDALE.

Attest:

GEO. H. KNIGHT, JAMES H. LAYMAN. 

